Paul S. Boyer, et al., eds., The Enduring Vision: A History of the American People, 6th ed. (Boston, MA: Houghton Mifflin Company, 2008), 388.
Between 1846 and 1848 the United States successfully fought a war with Mexico that led Mexico to renounce all claims to Texas and cede its provinces of New Mexico and California to the United States. Many Americans rejoiced in the stunning victory. But some recognized that deep divisions over the status of slavery in New Mexico and California boded ill for their nation's future.